Blasting cartridge with cover and process of production



L. LISSE 1,767,182 RIDGE WITH COVER AND PROCESS OF PRODUCTION June 24, 1930.

BLASTING CART Filed March 14, 1929 Fatentecl June 24, 1930 p I. I

UNITED STATES PATENT OFFICE LEOPOLD LISSE, F BERLIN-LICETEBFELDE, GERMANY BLASTING CARTRIDGE WITH COVER AND PROCESS OF PRODUCTION Application filed March 14, 1929, Serial No. 847,141, and in Germany January 12, 1928.

This invention relates to acovering sleeve suitable material into which the cartridge for cartridges and to a method for producis then inserted. ing the covering sleeve on the cartridge so Two embodiments of the invention are that one and the same cartridge can be used illustrated by way of example, in the accomfor the most various effects in using for inpanying drawing;

stance a cover possessing dynamic effect in- Fig. 1 shows a cartridge in elevation and creasing the dynamic effect of the-blasting the enclosing sleeve in section. cartrid e or, for reducing the dynamic Fig. 2 shows in section a cartridge and its effect 0 thecartridge, a cover is used which enclosing sleeve of another form of conhas a less great or no explosive effect, said struction than shown in Fi 1. 60

cover covering the cartridge entirely or Fig. 3 is a cross section 0 Fig. 1. partly. The sleeve a is placed over the cartridge The novelty of the invention consists in envelope 6 which holds the explosive mathat, after saturation of the cartridge, the terial c. The sleeve a is made of fire proof impregnated and saturated cartridge is enmaterial or of fire extinguishing material veloped in a sheet of aluminium foil or in an and rendered fire-proof or incombustible envelope having a similar effect in order to with or without a matrix. This can be done increase or decrease the dynamimeffect of by dipping the sleeve a into a mixture of the cartridge, so that according to requireinfusorial silica, salt or similar water-conment a dynamic explosive effect can be obtaining 0r incombustiblematerial so that it 70 tained with a less explosive cartridge than is impregnated, or by coating it with such with a cartridge, which is explosive itself, a substance with the aid of a matrix, like a less strong dynamic effect can be obtained waterglass. For higher dynamic effect the according to whether the cartridge is encartrid e, consisting of the charge d and of veloped completely or partly. Instead of an enve ope 6, may, after having been satuwrapping the impregnated cartridge in rated, be enclosed entirely or partly with an aluminium foil or in a foil of a similar metal aluminium foil 7 or with a sleeve of a mateor substitute metal, it may be rolled in rial having a similar dynamic effect, the metal powder and thus covered entirely or cartridge being then fired. Instead of wrappartly with the metal. .A cartridge possessping the cartridge after saturation in a 80 mg dynamic effect may be transformed metal foil, it might be rolled in a metal into a safety cartridge by enclosing it, after powder. the impregnation, in water-containingor It has become known to add to blasting flame extinguishing means. cartridges aluminium powder and similar B thi new process th t, o omi metal powders for mcreasing the explosion advantage is obtained that, in mines or at P fiq have however other places wher cartridg with diff r nt; complamed of the mconvenience that they dynamic effects are required, only one kind have to keep in store in one mine two differof cartridges need be kept in store. The entildnds of cartridges if, in the interest of 0 cartridge is then, according to requirement, thework to be done, blasting cartridges of prepared for stronger dynamic effect or as, different dynamic powers have to be used. safety cartridge, before it is used after the Experiments have shown that a blasting saturation. cartridge of medium dynamic effect, after It is consequently impossible that mishaving been impregnated with liquid oxy- 5 takes inselecting cartridges be made, as gen, is transformed, between the removing only cartridges of the same composition are of the cartridge from the impregnating vesused for the different purposes. sel and the introduction into the bore hole Instead of covering or coating the caror the placing on the object to be blasted,

- tridge, the bore hole might be lined with the into a blasting cartridge possessing dynamic mo effect, by rolling the moist or freshly im- -pregnated blasting cartridge over a sheet of aluminium foil so that this foil adheres on the entire length of the cartridge, the cartridge being then inserted into the bore hole with this cover.

A similar result can be obtained by producing on the blasting cartridge, saturated with liquid oxygen, a, coating by rolling the m cartridge after the impregnation in aluminium powder or in any other suitable powder.

I claimz- 1. A rocess of regulating the dynamic efiect o blasting cartridges, consisting in covering the cartridge coming from the imregnat1ng bath with alumimum or equivaent material, said coating being of a thickness according to the degree of dynamic effect to be obtained.

2. A rocess of regulating the dynamic efiect 0 blasting cartridges impregnated with liquefied gas, consisting in covering the cartridge after the impregnation with a coating whereby the evaporation of the li uid is regulated.

n testimony whereof I afiix my si nature.

DR. LEOPOLD LfSSE. 

